The Lieutenant of the Tower of London is a ceremonial position responsible for overseeing the Tower of London, a historic castle located on the north bank of the River Thames in central London. This role includes managing the security and maintenance of the Tower, which has served various purposes throughout history, including a royal palace, prison, and treasury. The Lieutenant is also in charge of the Yeoman Warders, commonly known as the Beefeaters, who serve as guardians and tour guides for visitors. The position has a rich history, dating back to the 14th century, and is often held by a senior military officer.